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&gt; 学习CTF已经有一段时间了，陆陆续续也做了不少题。为了准备前段时间的全国大学生信息安全大赛，又把许多题目重新看过一遍。现在也终于闲下来一两天，正好趁这个机会把在bugku靶场做出的题目整理一下。


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                <h4><center>前言：</center></h4>
> 学习CTF已经有一段时间了，陆陆续续也做了不少题。为了准备前段时间的全国大学生信息安全大赛，又把许多题目重新看过一遍。现在也终于闲下来一两天，正好趁这个机会把在bugku靶场做出的题目整理一下。

<hr>
<h6 id="web1"><a href="#web1" class="headerlink" title="web1"></a>web1</h6><p>打开看到一大堆滑稽，F12查看网页源代码就能发现flag，明显的送分题。</p>
<h6 id="web2"><a href="#web2" class="headerlink" title="web2"></a>web2</h6><p> 题目描述输入验证码即可得到flag，正常输入发现只能输入1位，F12，将maxlength=”1”改为maxlength=”2”即可正确输入,得到flag。还是送分题。</p>
<pre class="line-numbers language-none"><code class="language-none">flag&#123;ea008b7aaab0d3ea27c8580df13f52c3&#125;<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h5 id="web3"><a href="#web3" class="headerlink" title="web3"></a>web3</h5><p>根据题意构造url即可得到flag</p>
<pre class="line-numbers language-none"><code class="language-none">http:&#x2F;&#x2F;114.67.246.176:14287&#x2F;?what&#x3D;flag
flag&#123;45240136ecbcb3c6db9d1dcb756ced4b&#125;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>
<h6 id="web4"><a href="#web4" class="headerlink" title="web4"></a>web4</h6><p>跟上一道题类似，只不过这次是post，使用Firefox插架Max HackBar输入what=flag得到flag</p>
<pre class="line-numbers language-none"><code class="language-none">flag&#123;1e7a6931002d229ac37085a846d21e6d&#125; <span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h6 id="web5"><a href="#web5" class="headerlink" title="web5"></a>web5</h6><p>题目描述<strong>矛盾</strong>，打开链接看到相应php代码描述。if=($num==1) 意思就是num等于数字1就会打印flag 但是is_numeric函数检测数字意味着，<strong>既要是数字1，又不能是数字。</strong><br>在评论区有这个介绍。</p>
<blockquote>
<p>PHP一个数字和一个字符串进行比较或者进行运算时，PHP会把字符串转换成数字再进行比较。PHP转换的规则的是：若字符串以数字开头，则取开头数字作为转换结果，若无则输出0。 在PHP中，== 会先进行类型转换，再进行对比，而===会先比较类型，如果类型不同直接返回不相等。</p>
</blockquote>
<p>题目中正好使用的是==号我们可以构造类似1a的数字加字母的组合。<br>构建url得到flag：<br><em>flag{2b16dd84ae5d35c74fe16c759849b871}</em></p>
<h6 id="web6"><a href="#web6" class="headerlink" title="web6"></a>web6</h6><p>直接查看网页源代码，得到unicode编码解码得到相flag。<br> <strong>flag{f41c9ed6534a088591cfc7cb118d8b46}</strong></p>
<h6 id="web7-你必须让他停下来"><a href="#web7-你必须让他停下来" class="headerlink" title="web7 你必须让他停下来"></a>web7 你必须让他停下来</h6><p>右键查看源代码，然后一直刷新源代码的页面，就能得到flag，当然有burpsuit抓包，然后sendtorepeter，一直send也一样，在第10张jpg的响应里边就有flag.<br>这两种方法本质上是一样的。</p>
<pre class="line-numbers language-none"><code class="language-none">flag&#123;222c6ea6e3f1b78d0e47688932d6c097&#125;<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p>在补充一点提交flag时要记得把代理关上。</p>
<h6 id="web8-文件包含"><a href="#web8-文件包含" class="headerlink" title="web8 文件包含"></a>web8 文件包含</h6><pre class="line-numbers language-php" data-language="php"><code class="language-php"> <span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
    <span class="token keyword">include</span> <span class="token string double-quoted-string">"flag.php"</span><span class="token punctuation">;</span>
    <span class="token variable">$a</span> <span class="token operator">=</span> @<span class="token variable">$_REQUEST</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'hello'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token keyword">eval</span><span class="token punctuation">(</span> <span class="token string double-quoted-string">"var_dump(<span class="token interpolation"><span class="token variable">$a</span></span>);"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">show_source</span><span class="token punctuation">(</span><span class="token constant">__FILE__</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>审计PHP代码得到以下信息。</p>
<blockquote>
<p>request函数表明可以任选get或post方法提交<br>helloeval() 函数把字符串按照 PHP 代码来执行<br>show_source用来返回文件内容<br>include函数会将flag.php包含在该文件中</p>
</blockquote>
<p>由此我们可以构建url <strong>/?hello=show_source(‘flag.php’)<strong>或者</strong>?hello=file(‘flag.php’)<strong>均能得到flag。</strong>flag{e5d1a21b2cf1819415ce4ba106e868d9}</strong></p>
<h6 id="web9"><a href="#web9" class="headerlink" title="web9"></a>web9</h6><pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token function">error_reporting</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">include</span> <span class="token string double-quoted-string">"flag1.php"</span><span class="token punctuation">;</span>
<span class="token function">highlight_file</span><span class="token punctuation">(</span>__file__<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'args'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    <span class="token variable">$args</span> <span class="token operator">=</span> <span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'args'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">preg_match</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"/^\w+$/"</span><span class="token punctuation">,</span><span class="token variable">$args</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">die</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"args error!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span><span class="token keyword">eval</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"var_dump(<span class="token interpolation"><span class="token variable">$$args</span></span>);"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token punctuation">&#125;</span>
<span class="token operator">?</span><span class="token operator">></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>php代码实际上就是最大的提示。</p>
<blockquote>
<p>flag in the variable：提示flag在变量里面<br>preg_match：使用正则表达式匹配，/^\w+$/ 表明只能输入数字和英文字母及下划线<br>说明此时只能用全局变量查看GLOBALS</p>
</blockquote>
<p>构造?args=GLOBALS得到flag：<br><em>flag{6ee63ee40bbaf7d0992a373217f73f43}</em></p>
<h6 id="web10-头等舱"><a href="#web10-头等舱" class="headerlink" title="web10 头等舱"></a>web10 头等舱</h6><p>我觉得这道题真的是送分的，F12查看网络在响应头里就能得到flag。当然抓包也一样但是麻烦了。</p>
<h6 id="web-11-网站被黑"><a href="#web-11-网站被黑" class="headerlink" title="web 11 网站被黑"></a>web 11 网站被黑</h6><blockquote>
<p> 描　　述: 网站被黑了 黑客会不会留下后门 </p>
</blockquote>
<p>既然提示了后门的存在就用，扫描工具扫描下。利用御剑扫描，扫出来两个.php一个是那个黑页，另一个是一张登录界面。<br><img src="https://upload-images.jianshu.io/upload_images/24919094-ff37e575621d6bc1.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"><br>在得到网址后进项抓包，直接用burp suit自带的爆破功能爆破下就OK了。（注burp suite的社区版爆破功能好像不是很全，推荐去找一个别人破解的专业版）<br><img src="https://upload-images.jianshu.io/upload_images/24919094-fea2aa6bcd261fd2.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"></p>
<h6 id="web-12-本地管理员"><a href="#web-12-本地管理员" class="headerlink" title="web 12 本地管理员"></a>web 12 本地管理员</h6><p>查看网页源代码在一堆n后面有个base64，解码得到管理员密码，账户盲猜admin登录，提示IP禁止访问，请联系本地管理员登陆，IP已被记录.使用本地管理员登录，就要进行IP伪造，编辑消息头，X-Forwarded-For:127.0.0.1。得到flag</p>
<h6 id="game1"><a href="#game1" class="headerlink" title="game1"></a>game1</h6><p>一道游戏题，正常来说游戏应该是杂项吧，这一次的游戏题有一说一竟然让我忘了我是来做题的。<br>在评论区得到大佬的提示，这一道游戏题分数上限是99999，使用burp suite抓包，在最后出成绩时能看到</p>
<blockquote>
<p>GET /score.php?score=200&amp;ip=223.104.190.201&amp;sign=zMMjAw== HTTP/1.1</p>
</blockquote>
<p>sign=zMMjAw像是base64加密，但是直接解算不出来，多玩几次游戏，发现zM是一直都有的，对后面的部分解码正是游戏得到的分数。构造url</p>
<blockquote>
<p>score.php?score=99999&amp;ip=223.104.190.201&amp;sign=zMOTk5OTk==</p>
</blockquote>
<p>得到flag。<em>flag{78544bfa1e21dcf4dcbd7488870b267f}</em></p>
<h6 id="web13-看看源码吧"><a href="#web13-看看源码吧" class="headerlink" title="web13 看看源码吧"></a>web13 看看源码吧</h6><pre class="line-numbers language-none"><code class="language-none">var p1 &#x3D; &#39;%66%75%6e%63%74%69%6f%6e%20%63%68%65%63%6b%53%75%62%6d%69%74%28%29%7b%76%61%72%20%61%3d%64%6f%63%75%6d%65%6e%74%2e%67%65%74%45%6c%65%6d%65%6e%74%42%79%49%64%28%22%70%61%73%73%77%6f%72%64%22%29%3b%69%66%28%22%75%6e%64%65%66%69%6e%65%64%22%21%3d%74%79%70%65%6f%66%20%61%29%7b%69%66%28%22%36%37%64%37%30%39%62%32%62&#39;;
var p2 &#x3D; &#39;%61%61%36%34%38%63%66%36%65%38%37%61%37%31%31%34%66%31%22%3d%3d%61%2e%76%61%6c%75%65%29%72%65%74%75%72%6e%21%30%3b%61%6c%65%72%74%28%22%45%72%72%6f%72%22%29%3b%61%2e%66%6f%63%75%73%28%29%3b%72%65%74%75%72%6e%21%31%7d%7d%64%6f%63%75%6d%65%6e%74%2e%67%65%74%45%6c%65%6d%65%6e%74%42%79%49%64%28%22%6c%65%76%65%6c%51%75%65%73%74%22%29%2e%6f%6e%73%75%62%6d%69%74%3d%63%68%65%63%6b%53%75%62%6d%69%74%3b&#39;;
eval(unescape(p1) + unescape(&#39;%35%34%61%61%32&#39; + p2));<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<p>使用<a target="_blank" rel="noopener" href="http://tool.chinaz.com/tools/urlencode.aspx">在线工具解码</a>得到三段url按照要求进行拼接</p>
<blockquote>
<p>function checkSubmit(){var a=document.getElementById(“password”);if(“undefined”!=typeof a){if(“67d709b2b54aa2aa648cf6e87a7114f1”==a.value)return!0;alert(“Error”);a.focus();return!1}}document.getElementById(“levelQuest”).onsubmit=checkSubmit;</p>
</blockquote>
<p>中间那一段就是要在网页上提交的东西,提交得到flag；</p>
<blockquote>
<p>flag{f51a5a7335f538b979ac5eaf43e4cad6}</p>
</blockquote>
<h6 id="web14"><a href="#web14" class="headerlink" title="web14"></a>web14</h6><p>怎么说呢？这道题考察了<a target="_blank" rel="noopener" href="https://blog.csdn.net/qq_32393893/article/details/110228864">文件包含&amp;PHP伪协议</a>这个作者整理的很好，可以去借鉴借鉴。<br>构造一个url</p>
<blockquote>
<p>php?file=php://filter/read=convert.base64-encode/resource=index.php<br>读取目标服务器文件内容，并讲这些内容进行base64编码，我们只需要解码就可以了。</p>
</blockquote>
<pre class="line-numbers language-none"><code class="language-none">DQogICAgDQo8P3BocA0KCWVycm9yX3JlcG9ydGluZygwKTsNCglpZighJF9HRVRbZmlsZV0pe2VjaG8gJzxhIGhyZWY9Ii4vaW5kZXgucGhwP2ZpbGU9c2hvdy5waHAiPmNsaWNrIG1lPyBubzwvYT4nO30NCgkkZmlsZT0kX0dFVFsnZmlsZSddOw0KCWlmKHN0cnN0cigkZmlsZSwiLi4vIil8fHN0cmlzdHIoJGZpbGUsICJ0cCIpfHxzdHJpc3RyKCRmaWxlLCJpbnB1dCIpfHxzdHJpc3RyKCRmaWxlLCJkYXRhIikpew0KCQllY2hvICJPaCBubyEiOw0KCQlleGl0KCk7DQoJfQ0KCWluY2x1ZGUoJGZpbGUpOyANCi8vZmxhZzpmbGFne2U4M2VlOWM2YWY5MjdkYWFmMjAyMTExNjE1ZWJjOWYxfQ0KPz4NCjwvaHRtbD4NCg<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p>对着一长串进行解码得到</p>
<pre class="line-numbers language-none"><code class="language-none">&lt;?php
	error_reporting(0);
	if(!$_GET[file])&#123;echo &#39;&lt;a href&#x3D;&quot;.&#x2F;index.php?file&#x3D;show.php&quot;&gt;click me? no&lt;&#x2F;a&gt;&#39;;&#125;
	$file&#x3D;$_GET[&#39;file&#39;];
	if(strstr($file,&quot;..&#x2F;&quot;)||stristr($file, &quot;tp&quot;)||stristr($file,&quot;input&quot;)||stristr($file,&quot;data&quot;))&#123;
		echo &quot;Oh no!&quot;;
		exit();
	&#125;
	include($file); 
&#x2F;&#x2F;flag:flag&#123;e83ee9c6af927daaf202111615ebc9f1&#125;
?&gt;
&lt;&#x2F;html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>得到flag。</p>

                
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</div>

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$(function () {
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                // get the contents from search data
                var datas = $("entry", xmlResponse).map(function () {
                    return {
                        title: $("title", this).text(),
                        content: $("content", this).text(),
                        url: $("url", this).text()
                    };
                }).get();
                var $input = document.getElementById(search_id);
                var $resultContent = document.getElementById(content_id);
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                    var keywords = this.value.trim().toLowerCase().split(/[\s\-]+/);
                    $resultContent.innerHTML = "";
                    if (this.value.trim().length <= 0) {
                        return;
                    }
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                        var data_title = data.title.trim().toLowerCase();
                        var data_content = data.content.trim().replace(/<[^>]+>/g, "").toLowerCase();
                        var data_url = data.url;
                        data_url = data_url.indexOf('/') === 0 ? data.url : '/' + data_url;
                        var index_title = -1;
                        var index_content = -1;
                        var first_occur = -1;
                        // only match artiles with not empty titles and contents
                        if (data_title !== '' && data_content !== '') {
                            keywords.forEach(function (keyword, i) {
                                index_title = data_title.indexOf(keyword);
                                index_content = data_content.indexOf(keyword);
                                if (index_title < 0 && index_content < 0) {
                                    isMatch = false;
                                } else {
                                    if (index_content < 0) {
                                        index_content = 0;
                                    }
                                    if (i === 0) {
                                        first_occur = index_content;
                                    }
                                }
                            });
                        }
                        // show search results
                        if (isMatch) {
                            str += "<li><a href='" + data_url + "' class='search-result-title'>" + data_title + "</a>";
                            var content = data.content.trim().replace(/<[^>]+>/g, "");
                            if (first_occur >= 0) {
                                // cut out 100 characters
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                                var end = first_occur + 80;
                                if (start < 0) {
                                    start = 0;
                                }
                                if (start === 0) {
                                    end = 100;
                                }
                                if (end > content.length) {
                                    end = content.length;
                                }
                                var match_content = content.substr(start, end);
                                // highlight all keywords
                                keywords.forEach(function (keyword) {
                                    var regS = new RegExp(keyword, "gi");
                                    match_content = match_content.replace(regS, "<em class=\"search-keyword\">" + keyword + "</em>");
                                });

                                str += "<p class=\"search-result\">" + match_content + "...</p>"
                            }
                            str += "</li>";
                        }
                    });
                    str += "</ul>";
                    $resultContent.innerHTML = str;
                });
            }
        });
    };

    searchFunc('/shier_jinghuang/search.xml', 'searchInput', 'searchResult');
});
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